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不锈钢粉尘是一种产生量大、粒度细小、杂质含量高、极具回收利用价值的二次资源。为了开发不锈钢粉尘高效利用工艺,采用化学分析、XRD、扫描电镜等方法,对EAF和AOD不锈钢除粉尘的化学成分、粒度、物相组成、Cr~(6+)浸出及微观形貌进行了研究。结果表明,不锈钢粉尘中Ni、Cr、Fe含量较高,且均以氧化物形式存在;粉尘中的主要物相有铬铁尖晶石、磁铁矿、钙镁橄榄石、石英及石灰等;粉尘中的Cr~(6+)含量极少,低于国家危险废弃物的限制要求,但高于饮用水国家标准。
Stainless steel dust is a large amount of production, small size, high impurity content, highly recycled secondary resources. In order to develop the efficient use of stainless steel dust, the chemical composition, particle size, phase composition, Cr 6+ leaching and micro-morphology of EAF and AOD stainless steel were studied by chemical analysis, XRD and SEM. . The results show that the contents of Ni, Cr and Fe in stainless steel dust are high and all exist in the form of oxides. The main phases of dust include ferrochrome spinel, magnetite, calcium and forsterite, quartz and lime. The content of Cr 6+ in dust is very little, lower than the national limit of hazardous waste, but higher than the national standard of drinking water.